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Wyszukujesz frazę "Ivanova, Tatiana Nikolaevna" wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Improvement of grinding technology with vortex cooling of steels that are liable to crack propagation
    Autorzy:
    Ivanova, Tatiana Nikolaevna
    Biały, Witold
    Nordin, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2064897.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    steel
    grinding
    temperature
    vortex cooling
    wheel
    Opis:
    Complexity of grinding process and phenomena entailing it not always allow reaching required technological results, especially while machining surfaces of parts made of tough-to-machine steels, which are liable to crack propagation. Cracks can occur in these parts during grinding due to considerable temperature difference along the section, which can cause formation of high temporary internal tensile stress. Application of cooled air in grinding process exerts considerable influence over temperature decrease in cutting area. In addition, it depends not only on heat exchange, but also on properties of cold air flow. The greatest effect of temperature decrease can be reached by injection of cold air flow in cutting area with implementation of vortex effect, which occurs in swirl flow of compressed air originating in vortex tube. The study of heat generation during machining by tools with discontinuous cutting surface and vortex air cooling was carried out. Obtained thermophysical parameters of vortex air cooling (increase in speed of stream flowing, expansion degree, share of cold stream and decrease in humidity of air stream) allow reducing heat density due to growth of cooling effect in grinding zone. On the base of experimental studies we developed recommendations for choice of optimal grinding modes by tool with discontinuous cutting surface and vortex air cooling of flat parts made of steels being liable to cracking.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 9--23
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors, increasing the efficiency of work of maintenance, repair and operation units of industrial enterprises
    Autorzy:
    Krynke, Marek
    Ivanova, Tatiana Nikolaevna
    Revenko, Nikolay Fedorovich
    Powiązania:
    https://bibliotekanauki.pl/articles/2175873.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    maintenance
    repair and operation (MRO)
    method of organization of work of equipment MRO service
    level of economic autonomy of MRO enterprise
    Opis:
    The article contains the analysis of factors influencing the efficiency of work of equipment maintenance, repair and operation (MRO) units of industrial enterprises. We have systematized various classifications of these factors, which were proposed in economic literature by different authors. We have divided the factors into following groups: general and local; primary and secondary; external and internal; major and non-essential; direct and oblique; reducing and boosting the expenses on equipment MRO and repair cost; production and non-production; depending on management and independent; economic, operation, organization ones; structural and production-technical ones; which are interconnected. It has been proposed to classify factors influencing the efficiency of equipment MRO units into five groups: economic, exploitation, organization, production-technical and structural ones. Using expert evaluation method, the factors have been divided into three groups according to degree of their influence on efficiency of work of equipment MRO units of industrial enterprises. The priority was given to the factors of the first group, having decisive influence on formation of efficiency. The most significant factors have been identified. In opinion of experts, these factors include: method of organization of work of equipment MRO service; level of economic autonomy of MRO enterprise in terms of organization of equipment MRO; financial and market situation of enterprise; the degree of repair complexity of production equipment.
    Źródło:
    Management Systems in Production Engineering; 2022, 1 (30); 91--97
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Physical and Mechanical Properties of Steel During Grinding and Sharpening
    Autorzy:
    Biały, Witold
    Ivanova, Tatiana Nikolaevna
    Žarnovský, Jozef
    Ružbarský, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2064901.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    steel 8KHF
    sharpening
    edge
    thermal deformation
    structural transformations
    thermal process
    Opis:
    A direct influence on the physical and mechanical state of the surface layer of wedge-shaped plates made of 8KHF steel is exerted by heat generation processes developing in the zone of a high-speed thermal process. Research on the influence of the parameters of a high-speed thermal process on the change in the structure of 8KHF steel (GOST 5950-2000 Russia, standard PN/H 85023 brand NCV1 Poland) was fulfilled. It allowed studying the nature of the change in the microstructure depending on short-term heating to various temperatures and rapid cooling. As a result, critical points of the beginning and the end of structural transformations during heating were determined. Research on thermal processes in a high-speed thermal process made it possible to establish regularities of influence of cutting speed, source speed, contact area, coolant properties and heat transfer coefficient on the temperature and rate of thermal processes in surface layers, as well as their impact on the depth of heating to a certain temperature. The study also allowed us to show the relationship between temperature and rates of heating and cooling. The solution to this problem, taking into account the action of the cooling fluid, gives the opportunity to bring the picture of the development of thermal processes closer to real conditions and makes it possible to reasonably predict the structural state of the surface layer of wedge-shaped parts made of 8KHF steel under various conditions of a high-speed thermal process.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 128--140
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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